valume
The amount of matter in a given volume of space is called density.
Density is the amount of matter in a given space.
density
mass
density
is a measure of the amount of matter in a given amount of space
is a measure of the amount of matter in a given amount of space
is a measure of the amount of matter in a given amount of space
Its volume.
The amount of matter is given space is mass.
The "amount of matter" sounds like a description of the property called "mass". It might also refer to the amount of moles.
Volume